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R. K.. MEADE..

MLN., AAPPLICATION FILED IUNE 273| |921.

A 1192521. 3 SHEETS-SHEET 1.

Patented May 16 .2. 4 c l @ww Inn..

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R. K. MEADE.

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, .APPLICATION FILEDJUNEZS, I92I- 1,416,657. Patented May 16, w22.

3 SHEETS-SHEET 2.

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RICHARD K. MEADE, OF BALTIMOREQMARYLAND.

KILN.

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Speccation of Letters Patent.

Patented May f6, i922.

Application. filed June 23, 1921. Serial No. 479,732.

sioing in the city of Baltimore, State ofA Maryland, have inventedcertain new and useful Improvements in l.' lns, of which the followingis a specification.

The invention relates to improvements in lime and similar kilns. Thekilns to which my invention has particular application are the cupola orvertical 'type comprising an upright stack or cupola to which the stoneto be burned is fed at the top, the heat being supplied from one or morefurnaces at the bottom. .ln order to produce a uniform product andachieve economical operation of the kiln it is necessaryto maintain aconsi'derable degree of uniformity of operation and to this end it isnecessary to maintain a uniform supply and distribution or air. The airis fed by natural draft or suction established in and through theapparatus when the materials and furnace are heated and the quantity ofair passed through the apparatus is determined by the air opening at thebottom. 1 I

The coal consumption and grate areas employed in this connection aresmall and it has been customary to feed-the furnaces Which ordinarilyburn coall by handV but the vnecessity for opening the furnace doors during stoking and feeding has. on account of `the high degree of suctiondevelopedyre- Vsuited 1n the influx of an excess lofair when the furnaceis opened. The excess of air thusadmitted 1s detrimental asexcess cool-Y ing due to the heat abstracted from the ore tain definite temperaturesor stone by contact with the air which cannot be consumed and thereforemerely passes through the kiln acting as a heat carrier or heat vehicle.The cooling of the furnace Which results in this Way effects acorresponding cessation of the operation of the kiln for therock canonly be burned at cer` To counteract such influXes of? cold airit Wouldbe necesn furnaces during feeding and stoking and as further pointed outthe fuel consumption of such apparatus is too small to make an automaticStoker effective or desirable7 in fact the expense in accordance withthe present practice and conditions is considered prohi bitive.

To overcome the difficulties stated l have provided in connection with avertical or cupola type of lime or similar kiln, a hand operated stokerwhich is completely closed and arranged that the lire can be efcientlvmaintained for an indefinite period under all conditions Without thenecessity for opening the iurnace to give access thereto for st kingpurposes. The stoker or furnace being also provided with a hopper feedwhich completely closed under all normal furnace conditions which makesit possible to regulate the air supply to give uniformity of lfeed anddistribution and hence regularity and uniformity of operation, it beingunderstood that the poration of the kiln is continuous, the ore or stonebeing fed in the top and the burned or finished material removed fromthe bottom Without pause as to or interference with the burningoperation. Y

The invention further relates to the bottom portion of the furnace,i.-e., to an improved type of cooling cone adapted to hold and cool thematerial when it reaches the bottom of the furnace after burning justprior to its release and to an improved releasing means or shears andtbe details thereof. i

In the accompanying drawings I have illustrated a kiln structureembodying the various features of my invention in ther preferred form.

Figure l is an elevation partly in sect-ion showing the entire kilnstructure on a small scale;

Figure 2 is a section on the line QZ of Figure l, same beingcomparatively enlarged;

Figure Sis an enlarged section on a vertical plane taken longitudinallyof the furnace and stoker;

Figure el is a horizontal section on the line Jlin Figure 5;

Figure 5 is an elevation of the shears shotvingthe foundation Walls insection.

Referring to the drawings by numerals the structure as shown comprises akiln including an upright or vertical portion or stone 7 to kiln properl, furnaces 2, by which the kiln is heated, cooling cone 3 and'foundation or base 4. i

The kiln' proper as shown consists ofa cylindrical jacket or shell whichin the form illustrated is built up of boiler plates or similar materialenclosing an upright masonry structure 6 which may be linedwith-ire-brick and tapered to give a dimin ishing cross section. towardthe bottom. The tapering chamber thus formedis inthe operation of thekiln filledwith` the lime be burned, which lime stone may beisup'pliedAby meansof a tramway 8, tern minating on a platform 9, at the top of the'kiln from which the materialis dumped: in-

" to the kiln.

The furnace vstructure 2, by means of which the heat for treatingl orburning the limestone is supplied is best illustrated in Figure 3. Thedesired change in the material is accomplished by 'heating the limestoneto a sufficient temperature driving olfV moisvture and carbonfdioxideand leaving calcium oxide known as lime or quick lime. The heat is`communicated to the stone in the kilnby means of the products ofcombustion which are passed through the kiln; which inthisconnect-ionacts as a chimney or stack for the furnace. The gradual'heating ofthe materials in the kiln serves to setup `a sutlicient'natural draft;

lt h'asbeen customary inthe .past to feed and stokethe furnaces. whichare comparatively small, by hand but the opening of the furnace `doorsincidental to hand feeding and stoking results in the `introduction ofan excess of'cold air whichV ation Of'coalburning kiln, I have provided.al

hand operated automatic feeding and stoking device which is complete initself and ca- GO y yand uniformity of operation and `of distri-v pableof operation forlong periods,- in fact.

indefinitely. without opening the furnace doors so that theairsupplytothe Vfurnaces and kilns may belregulated in exact accordance Vwith thechemical requirements ofi the process includingthe vcom-bustion ofthefuel eliminating the necessity for admittingexcess air with theconsequent loss of etliciency.

bution as already pointed out.

To this endfeach of the furnaces 2, is proaidedl with a hand stokingfapparatusv l0, consisting of a grate 11, made up of arcuate it is'foundthatV grate sections l2, mounted to swing on jouring section 14 which`is likewise operated from outside the furnace by means of a rod 16extending through the front wall of the furnace. The fuel opening ofthefurnace is closed by means of a hopper 17 from which the fuel maybefed asV needed or more or less automatically fed and distributed bythestok-ing operation. The important featureisas already pointed outthatlthe is fedl and maintained without the necessity for openingV thefurnace, doors during the operation of the kiln.V The stokingV gratereferred to isfully described in the Huber Patent No. 1,232,687.

In' Figures 4 and and to some eXtentrin .Figure l, I have illustratedthe details of the cooling cone andshears, the cooling cone being thestructure illustrated byV reference character 3, consisting of aninverted frustuuiof -a cone made of sheet iron andsupported beneath `thekiln-toreceive andhold the burned lime, cooling it prior to deliveryfrom the furnace to the barrel.V The coolingV cone may to advantage beprovided with a water'jacket 18, which prevents burning of theconestructure and assists the cooling of thelime. The jacket is suppliedwith water by Way of a pipe, l9'from'any suitable source and thewatermay bereleasedfby way of anV Y outletV 20, whichlmay be controlled byany suitable valve 2l. Thebottom ofthe cone 22, through' which thematerial is discharged is controlled-by suitabledeors known in the lime.burning art as shears.4

TheA present invention includesan improved` shear structure illustratedparticu-V larly in Figures4L and 5; This consists of t'womectangularplates 23, each 'of which is suspended by suitablestirrups 24, each saidstirrupengaging. `opposite end. of ai plate so that there is onestirrupat each endrof each plate. These four stirrups extendupward from theplates and are pivoted atv their upper. ends to horizontal transverse.supportsll', controlled by means ,of linksfor connecting rods 25. Theserods are pivoted to the shearrplatesby pins 26, each near an outsidecorner of the: plates, it

being understood that there are four ofY theseLrods, andt thateach. ispivoted at its oppositefor swinging endto an arm 27 which is securedtoand swings with shaft 28, each said shaft28 being.provided with twoarms 27, which are. spaced apart and pivotally connected tothe free or.Vswinging ends of corresponding connecting rods 251 corners at one x onthe same side of the shafts 28 as do the arms 27, that is, toward theoutside and away from the cone, the shears being placed on the oppositeor inside of the shaft and the parts are so arranged that the actuatingarm of each shaft approaches the Vertical depending position When theshears are closed so that the Weight of the arm tending to swing theshaft downward causing the lower side of the shaft to swing toward thecone, tends to maintain the shears closed giving a gravity closingaction of the shears. Also the manner of the suspension of the shearplates as illustrated is such as to cause them to be suspended directlyfrom and beneath the pivots submitting the supporting means to a directstress Which is substantially of tension only and eliminating allharmful transverse stresses. The ever arms 27 about the shafts 28 arevery much shorter than the stirrups and the hand 1evers 3() are longerthan either, giving poWerful leverage in controlling and actuating theshears. Y

l have thus described specifically and in detail a single structureembodying my invention in the preferred form in order that the natureand operation of the same may be clearly understood. However, thespecific terms herein are used descriptively rather am ci than in alimitino` sense, the scope of the invention being defined in the claims.

What I claim and desire to secure by Letters Patent is:

l. In a kiln for burning lime or the like the combination of an uprightore chamber, a coal burning furnace at the bottom of the chamberconnected to the ore chamber so the latter acts as a stack, a stokinggrate in the furnace composed of rocking sections and a drop bar meansfor operating the stoking grate from outside the furnace, hopper feedingmeans for supplying the fuel to the grate the bottom of the kiln and thefurf nace being closed normally and during stoking to prevent theadmission of excess air to the kiln.

2. n a lime kiln the combination of an.

upright kiln chamber, a furnace at the botr ing fuel to the grate thebottom of the kiln and the furnace being closed normally and duringstoking to prevent the admission of excess air to the kiln.

Signed by me at Baltimore, Maryland, this 17th day of June, 1921.

RICHARD ri. MEADE.

lVitnesses PORTER H. FLAUTT,

Y bannis M. REELY.

